Infrared reflectance and transmission spectra in II-VI alloys and superlattices

Devki N. Talwar, Tzuen-Rong Yang, Zhe Chuan Feng, P. Becla

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Room temperature measurements of the far-infrared (FIR) reflectance spectra are reported for the polar optical phonons in a series of bulk Cd xZn1-xTe (0 ≤ x ≤ 1) and CdSexTe 1-x (0 < x ≤ 0.35) crystals grown by Bridgman technique. The composition-dependent spectra exhibited many fundamental aspects of lattice vibrations, while the results of long-wavelength optical modes for the end member binary compounds displayed phonon values in good agreement with the existing inelastic neutron scattering and/or Raman spectroscopy data. Using a standard methodology of multilayer optics with effective-medium dielectric tensors, we simulated the FIR transmission and reflectivity spectra at oblique incidence (Berreman's effect) in many II-VI free-standing thin films, epilayers and superlattices. Berreman's approach provided us with a strong basis for analyzing the infrared experimental data and offered an effective means of estimating the zone-center transverse and longitudinal optical (ωTO, ωLO) phonon frequencies in polar-semiconductor thin films and heterostructure materials of increasing technological importance.

Original languageEnglish
Article number174203
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number17
DOIs
Publication statusPublished - 2011 Nov 8

Fingerprint

Superlattices
superlattices
Infrared radiation
reflectance
Thin films
Infrared transmission
Inelastic neutron scattering
Lattice vibrations
Epilayers
Phonons
Temperature measurement
Tensors
Raman spectroscopy
Heterojunctions
Optics
Multilayers
lattice vibrations
Semiconductor materials
thin films
Wavelength

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Infrared reflectance and transmission spectra in II-VI alloys and superlattices. / Talwar, Devki N.; Yang, Tzuen-Rong; Feng, Zhe Chuan; Becla, P.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 84, No. 17, 174203, 08.11.2011.

Research output: Contribution to journalArticle

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